Project: PBR-Built Z/28

[TylerT/AZ28]

if you need a hand gimme a holler, but yea bucket of some sort and pull the rail sounds like your best bet

[Atrus]

oil pan would work too, being that I assume the rail will be up in the engine bay...it'd be a little less cumbersome I would think.

[Boost Addict]

Project: PBR-Built Z/28

Why not just do a cylinder power balance test? Pull each injector connector while it's running and see which one results in no change of RPM. Or use a noid light.

[Nocooler]

Joel - you are looking for a noid light.

Please don't pull them and let them spray.

Take it from me burns suck.

[JoeliusZ28]

Why not just do a cylinder power balance test? Pull each injector connector while it's running and see which one results in no change of RPM. Or use a noid light.

Because with the cam i cant tell at idle. It sounds fine. I only notice it when i put a load on the engine. The pcm has the same target idle rpm regardless of being a cylinder down it will use the iac to compensate.

Edit: i am also afraid of spark being the issue resulting in fuel building up and starting a fire in the exhaust

[JoeliusZ28]

Joel - you are looking for a noid light.

Please don't pull them and let them spray.

Take it from me burns suck.

Test will be done on a cold engine. Shouldnt take much to see which one isnt firing.

[dawdaw]

Thinking out loud here if i pull the fuel rail and attempt to start it all the injectors should cycle right? Trying to think how i can identify which one isnt working.

Have a remote starter and test light? You can figure out if the injector harness isn't lighting off one of the injectors pretty simple

[JoeliusZ28]

Where can i get a test light? Same as a timing light?

[Atrus]

Test light:

http://www.harborfreight.com/circuit-tester-30779.html

[Atrus]

Have a remote starter and test light? You can figure out if the injector harness isn't lighting off one of the injectors pretty simple

If he has a buddy to crank it over, which he needed if he was going to remove the rail and crank it, he wouldn't even need the remote starter.

Would an injector pulse be visible on a test light? Wasn't sure if it was too quick or anything.

[JoeliusZ28]

Thanks Kevin, also there are two wires per injector. Do i need to unclip the harness for this light tester or will it pick ip the pulse through the insulation? I just realized i can pull the fuel pump fuse and safely do this light test. I am worried about fuel building in the exhaust also if its a spark issue. My exhaust dumps near the gas tank a fire there would not be good.

[Atrus]

I would think you'd have to unclip the harness, unless you're OK with stabbing the "pointer" of the light through the insulation...they are made to do that, it's just a question of whether you want to do that.

One of the wires has to be a common ground - I'd guess that all injectors have 1 common colored wire and the rest all are different. Clip the end of the light on a ground, like the batter terminal, and then use the test light probe on the "uncommon" wire color for each injector.

[Nocooler]

Get a noid light - http://www.harborfreight.com/11-piec...set-97959.html

[Boost Addict]

The ground is what makes the injector fire. The connector will have a constant 12v and the injector driver in the PCM grounds the circuit for x amount of time, giving the desired pulse. Best idea is a noid light.

[nascarnate326]

Noid tester or an infred laser thermometer. I have both and the thermometer was the best spent money. Start the car and watch the temps on each primary. Which ever one is cold...winner winner chicken dinner. Takes about 2 min with the correct tool.